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United States Patent | 5,032,442 |
Yamazaki ,   et al. | July 16, 1991 |
Disclosed herein is a fibrillated weatherproof web having a network structure, which can be produced with ease and is economical. The web comprises a multilayer composite film composed of at least two layers, one being a first layer (I) made of a first thermoplastic resin and the other a second layer (II) made of a second thermoplastic resin having a melting point lower than the first thermoplastic resin and containing at least 300 ppm of a light resistance imparting agent. A number of slits have been formed in a longitudinal or transverse direction. The web has been oriented at a draw ratio in a range of from 1.1 to 15 times. A nonwoven fabric making use of one or more fibrillated webs of the above sort and processes for the production of the web and nonwoven fabric are also disclosed.
Inventors: | Yamazaki; Shinji (Chiba, JP); Kotsuka; Toshio (Yokohama, JP) |
Assignee: | Nippon Petrochemicals Company, Ltd. (Tokyo, JP) |
Appl. No.: | 422657 |
Filed: | October 17, 1989 |
Nov 09, 1988[JP] | 63-281345 |
Current U.S. Class: | 428/105; 264/146; 264/147; 264/154; 264/DIG.47; 428/109; 428/131; 428/134; 428/136; 428/137; 524/91; 524/205; 524/236; 524/291; 524/361; 524/785 |
Intern'l Class: | B32B 005/12 |
Field of Search: | 264/DIG. 47,146,147,154 428/131,137,138,134,136,105,109 524/91,236,291,205,361,785 |
3169899 | Feb., 1965 | Steuber | 428/198. |
3669795 | Jun., 1972 | Yazawa et al. | 156/265. |
3734812 | May., 1973 | Yazawa | 428/109. |
3906073 | Sep., 1975 | Kim et al. | 264/DIG. |
4129632 | Dec., 1978 | Olson et al. | 264/DIG. |
4297469 | Oct., 1981 | Hamakt | 264/DIG. |
4410587 | Oct., 1983 | Fair et al. | 428/105. |
4861639 | Aug., 1989 | Vittone et al. | 428/105. |
TABLE 1 __________________________________________________________________________ Exposure time (hr) Example Additive (ppm) Physical property 0 300 600 900 1200 1500 __________________________________________________________________________ Ex. 1 Light resistance Bonding strength 8.1 8.1 7.6 6.2 -- -- imparting agent Tensile strength 22.1 22.6 20.3 16.8 -- -- (1000) Elongation 18.7 19.1 16.2 12.4 -- -- Ex. 2 Light resistance Bonding strength 8.8 8.6 9.3 8.8 -- -- imparting agent Tensile strength 24.1 23.9 23.5 20.0 -- -- (3000) Elongation 19.5 22.0 19.3 15.4 -- -- Ex. 3 Light resistance Bonding strength 8.3 8.5 8.7 8.1 -- -- imparting agent Tensile Strength 23.5 24.2 23.2 20.6 -- -- (5000) Elongation 18.3 20.8 19.0 15.0 -- -- Ex. 4 Light resistance Bonding strength 8.0 7.6 7.3 7.4 7.5 -- imparting agent Tensile strength 22.5 22.8 20.4 20.3 20.5 19.5 (3000), Al Elongation 17.3 19.8 15.8 16.89 16.5 13.8 Ex. 5 Light resistance Bonding strength 7.9 8.2 7.9 7.5 7.4 -- imparting agent Tensile strength 23.6 23.0 22.8 19.7 18.5 17.7 (5000), Al Elongation 18.8 18.3 17.3 16.8 14.8 13.0 Comp. Light resistance Bonding strength 8.2 8.3 6.5 4.5 -- 2.3 Ex. 1 imparting agent Tensile strength 21.3 18.8 17.2 11.6 -- 11.0 (0) Elongation 18.5 18.8 13.3 7.9 -- 6.9 Comp. Light resistance Bonding strength 8.4 8.5 7.4 5.0 -- -- Ex. 2 imparting agent Tensile strength 22.1 23.1 19.1 13.0 -- -- (200) Elongation 19.2 18.3 15.4 10.0 -- -- Comp. Light resistance Bonding strength 7.2 4.7 2.1 1.6 1.4 1.4 Ex. 3 imparting agent Tensile strength 27.0 21.4 15.3 14.4 11.1 9.0 (0), Al Elongation 23.0 17.8 11.8 10.5 6.5 4.8 __________________________________________________________________________